Ventilating shutter



May 19, 1959 GQRTH 2,887,034

VENTILATING SHUTTER I Filed April 9, 1957 INVNTQR United S.

The invention relates to a ventilating shutter system with laminae or louvers of substantially S-shaped cross section which partially overlap on the inlet and the outlet sides and which terminate in tangential closing surfaces.

In the construction of such laminae it is known to make the inlet leg portions shorter than the outlet leg portions and to arrange the laminae in such a way that each two adjoining laminae define a nozzle-like channel with an outlet cross section which is smaller than the inlet cross section and with inner leg portions extending into the room space to be ventilated.

It has been found that in a ventilating system comprising louvers of flattened S-shape cross section, in which the louvers partially overlap one another on the inlet as well as on the outlet side and the inlet legs are shorter than the outlet legs, and Where two adjoining louvers enclose a nozzle-like channel which tapers toward the outlet side, the shape of the louver can be greatly simplified, without adversely affecting the ventilating efficiency, by providing the end portion of the louver on the outlet side coinciding with its closing plane with an inward curvature, whereas, elsewhere said end portion is elongated. The inner leg of the lamina may then be of flat design. This results in a simpler construction of the laminae and substantial improvement in screening outward radiating light rays without affecting the suction effect for the extraction of room air. The elongated inner leg section may then be heavier or thicker so as to make it possible to provide it with supporting pins for pivotally mounting the laminae, or it may be provided with a perforation for receiving a supporting shaft permitting mutual rocking of the laminae for the purpose of adjusting the same to regulate the suction effect.

The rockable mounting of the laminae assumes particular importance when the ventilating system is used in exhibition halls, concert halls, or theaters equipped With hot-air heating systems inasmuch as heat losses during the heating-up period can be prevented by closing the ventilating system.

The new construction will hereinafter be described more in detail, reference being made to the accompanying drawing, in which Fig. 1 is a partial elevational view of the lamina, and

Fig. 2 is a cross section.

As shown in Figure 2 the louvers or vanes each have the shape of an elongated flattened S with inner and outer legs 1 and 2, respectively, located at the room-side and out-side of a conventional window opening. These vanes are arranged in overlapping nested relation in a frame normally set vertically in a window opening or the like. The outer legs 2 include a straight flat portion 2 which lies in a plane parallel to but offset from the inner leg portion 1. Thus the inner and outer legs of each vane are displaced laterally and longitudinally to provide when assembled with adjacent vanes, an exhaust or room air aspirating duct 3.

The inner leg 1 is shorter than the outer leg 2 so that when the vanes assume the position shown in Figure 2, for example, a nozzle-like or exhaust duct channel 3 is provided. This duct is formed between each two adjoining vanes and is shallower at the outlet or exhaust side than at its inner side. Because the duct becomes shallower at its outlet end, and the terminal or marginal pore s atent O 2,887,034 Fatented May 19, 1959 tion 4 of the outer leg 2 is curved inwardly or concave, as indicated at 4, the down-stream end 5 of each Vane in cooperation with the oblique web 6 of an adjacent vane provides an augmented aspirating nozzle effect.

The concave airfoil surface 4 materially accentuates the aspirating effect when external air currents, shown by dotted lines x x are deflected or turned as indicated at y by the airfoil surface 4. That is to say, when wind currents impinge on the curved surface 4 and are deflected outwardly, the aspirating effect in the duct assures the evacuation of room air into the atmosphere.

The curved portion 4 in addition to deflecting air currents in the manner described, also provides for the better screening of light rays that might otherwise enter between the terminal or tip portion 5 of one vane and the obliquely disposed web 6 of the adjoining vane.

It will now be seen that by varying the position of the terminal or tip portion 5 of one vane relative to the web 6 of an adjacent vane, the size of the outlet end of the outlet duct 3 may be regulated from a fully closed to a fully open position.

The inner leg is of heavier or stronger construction than the outer leg 2 with which it is connected by the inclined web 6. Near the junction of leg 1 and web 6 there is provided a longitudinal bore 7. By means of this longitudinal bore the vanes or louvers are pivotally mounted upon their respective supporting rods 8 so that, by jointly rocking all louvers, the shape of the air passages enclosed by them can be adjusted to existing operating conditions.

For jointly adjusting or rocking the louvers, the latter are provided with eyes 9 and are connected to operator or pull rod 11 by means of pins 10. The supporting rods 8 rest in opposite side channels or guides 12. Bores 7 with supporting rods 8 may also be replaced by trunnions provided on the frontal side of the laminae.

I claim:

1. An adjustable shutter for exhaust openings disposed between a room space and outside air, comprising, a frame in said opening, a plurality of louver elements pivotally supported in overlapping relation in said frame, and an operator common to all of said elements for adjustably setting the same to provide air stream exhaust ducts therebetween, each of said elements including, an inner leg normally parallel to the plane of the opening, an outer leg disposed in a plane offset to and substantially parallel with said inner leg, and an inclined web portion connecting the inner leg and the outer leg, the exterior portion of the exterior side of said outer leg being concave and having its terminal edge adapted to be spaced from the inclined web of an adjacent louver to provide an exhaust nozzle between the inner side of said concave edge portion and said web of an adjacent element, said concave edge portion constituting an airfoil surface whereby external air currents impinging thereon and deflected outwardly thereby will produce a resistance to the entry of outside air at the exhaust nozzle.

2. The adjustable shutter for exhaust openings according to claim 1, wherein the said web is thicker at the inner leg connection than at the outer leg connection.

References Cited in the file of this patent UNITED STATES PATENTS 887,722 Dorn May 12, 1908 1,137,473 Ford Apr. 27, 1915 1,519,553 Riker Dec. 16, 1924 2,123,287 Ney July 12, 1938 2,139,611 Welch Dec. 6, 1938 2,216,420 Rose Oct. 1, 1940 FOREIGN PATENTS 7,131 Great Britain Mar. 24, 1906 

